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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38af79774326b2ffb1b1b1b052325f596e2b5e4521d10378d4e5ba2c523663d7' 
  AND token = 'h9N/tWV22m4fuiDROq+u+d3ZuYC/Un6pPYIcfMfoON0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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