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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7456bb826ab1a3048eb802b24a1b2dbe0b275e0d7e971da06193d14bc30129de' 
  AND token = 'xbiGogAvLLUVlzEI2V7R/rlsCxNN67SGEuhS304UVEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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