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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5ac5d69b27d33085c47f781131d48f2e8131f23395697dfad4a510a250c583' 
  AND token = 'RotDp6Q/7E40bIwiYNXr0pUtUSc9Y+fn+WJiOH1RFL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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