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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa90151bb511c12a18ece8d16829c1eaa1cb465ec816f0221e92a7a137ddd1d' 
  AND token = 'hHha7SPvxZjHt/CvGCY86CoXIHHFJQymtD+wv94uwqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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