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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2aba7d896cbd1ecb413a94b9fc43474049fb5776d1315f468c1adf19f2314a' 
  AND token = 'E6bcBW8aV8DMaTJUK7mf25UKJ+B+XmhMyzwYYpmaDP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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