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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b5f405ae4252a90b47d5adf9c91a52daf9d20e397d453eae96f9d39eed7c6f' 
  AND token = 'NM8Rzjb4INe3pDT5u5Hk++R9ALTNJOJyBf+5AN9GY7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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