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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca96c0fd5c6dad502e8b33b6a9af7d210209a762d332edcc985ed0ef654f0b22' 
  AND token = 'dnkbByGv8CLN4S31pdwG3i9s8LHv41VxnVBNk/fOgkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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