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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7696b264a01042ae0703a4e9dbdd46416a03eb42f815a2383cf899d0895533df' 
  AND token = 'iJTSKWv4iKOaE0BK5hLfTDuc353Tnk1mSj2xRII5XYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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