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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bb83125084f0b3411df35d68bbd59d294f0a85bf102319d80631bcb6d40a68' 
  AND token = '4oTqMmsIdd15duaVO/O7LDaO2TTyIpsqSSFN4vCR4+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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