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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192f5c8f2f8357f9bdca767af2c409cca9e74c3340acd30c52b2bd92a9ffcf25' 
  AND token = '+pA31+WfKMBEzE+eYO9SjOf1nLUtSmr6gwYchgBn46o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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