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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07463412bf29d1149a6cadf6b79d44542b2ccfe72f0f92215380f8b9efa5fbf5' 
  AND token = '5p/7R1zGGKYExoXQfvQ0sj7HV//8ymW8GReWMmAA8yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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