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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26733216872a2b058fe6f88343cb577302cf7dd5a6e90909d1cdf7bcd59f9ef' 
  AND token = 'BdKLvQ+orRG59R689xHx/nhuDXq6fYsOWoyQCa3f5v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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