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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6007b3dc9eb0570460db571120e3cc2002f711d074ee179b16e442dd2a364623' 
  AND token = 'uUZUhyAcwuwfc0EfNk9yj/o/ZI/FJVqvX9o9htFrdqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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