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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a656e82e8aa6e5b6fa230bcf1aa546f0eab0967929fae2058911bd1d0a7d4c0a' 
  AND token = 'ECC8cEuJWPlOMvwW32d3Z5021f03BNKy98a6b2TqTjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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