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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5463dce85a3db1bc099c3938526dd5c8c4e00f83beadab04589e84e88211b3e7' 
  AND token = '2LZjFZsNOHCHRgr5q4xCVeaJu3JWtjvpSW3EsPt8Umc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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