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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78d2601452cfa700b6e0772f7d749b2082be6f6054324b5ca765b3aa60de3324' 
  AND token = '/Z0OyjcSpu4DhMXbXpR2MDF7XNUOOIsEuKbr5BvryWE=' 
  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"
    }
  }
}