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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4f21b0777c2710f3ffb263dacc6d114c94c2613b046295e7377ba82a9f2f3d' 
  AND token = 'odYfn6wkrNjp100jiVegq5raW9Jt9Diehl7EprxzoP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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