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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0750aaac96faf64baed9b2b40b0d6dd4cabbfb31ed28256004d9dfa65b0ba81d' 
  AND token = '8tDuIo+Q40/2kz2U5OyUbI9dSllkwU3+cDTgZiYI3Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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