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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9712a94b979c32cd90ffe3be62aea92196ef8e2b6dc359107caf2ebfaa339244' 
  AND token = '996S98kM2qdR6FaPi7VVVcXou2dU9I18eGin2nixrM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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