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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca0f5ea425e679a34f2dccb4eb57aa8cdc29a02e7dd6cdc7a3a8c885a2e9fd9' 
  AND token = 'rvQDvP7dUdQH45nv5Iqz3i7KC2yJOBNejimxEuWomr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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