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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e164050eb1ad4529152c8620b96973a0b1dc9239b26b411268439e3145da124' 
  AND token = 'kiR2WlZqRf2IRjPUqEPLz0NR0I5dkuKg8lDuONUF4po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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