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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bf274e4299926b1fd68a87df329c425d942ed64ac3a837deb91951bee8917d' 
  AND token = 'RB5vIg4CRR/TmgvL8kK62fKs/vn2hI7jRe3e8wIsVJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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