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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4e6a994d040d00592f5c033f34236a152b2cd68f8ee550ce55c77642b9b25f' 
  AND token = 'hqGg0gdG77n34gJUfipo6H9nsqc11HyZ/8gWWYq4sU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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