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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b82c5f109a07841a2868de2707f605b53fd054cea2db72db7cfc7c08d4ffc1' 
  AND token = 'itkr6+keLACNuDBzdPrr+rcH6gjCL1d5jkUXzyYVJmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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