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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1b75e04eed1108c8ca2e32aae8ea4221feefe2c92f1ab6c1d3fb6e94f4dbe3' 
  AND token = 'lbcSMFIrlmBtHPHTia+Gd4SsHUXveBVF212V4RbroCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}