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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fa1a9919c27e387fa3b006033b3396a0c28add83e3aca1f6da79ba2befa97e' 
  AND token = 'OVaAVhEKT40Jv6N83UFeEEbhdnW2fEC4AUeS7ExWD3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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