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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1be45549bc6daf67c5b3d2f31f06c562857a918f0240a70e7291e33287a004e' 
  AND token = '705YiWnMIs+F13+Z31CeWPyrT7wCtAa6mKhOH9z9hLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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