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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5deca64d54aa6cf20e002f8601d1c9559991299a215778a5ca1f747143b422f4' 
  AND token = '+880S+6B21vx8XE2hflkNowP6tPgU0N9S0RYzOluIT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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