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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3262de96dbdc999d8407184ce70afafe408a752dfc33d73fed50c8fc465a89a' 
  AND token = '7n+aal3d/W8Offsvje/LKPaPDJUBOaYFh6Q+jZfh9Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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