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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed62a2a053af7415c2f51b54c6364a3ca529776fe88618919ea34b5a7bf5afee' 
  AND token = 'yu0Y6jWimryzNh6UQcoDwxzgecD5AazekLMUPg0fBMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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