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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0cc2b0d66d6ab896f5dfa00d81d237f9c4411b7b5be451024e71947c2dbaf2' 
  AND token = 'qzptNSgk+X84aVHuJHcM/SIR3hyGk1TuU9x59BbOtls=' 
  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"
    }
  }
}