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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0a88689fe1d073c1f8b5c000e414625ffe0697f02d2b11d1b92516c916f135' 
  AND token = 'YV7SzlAbOkQkmDZZz3+79jP3QvbVUylN1bGma5qY3VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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