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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf533057f06e38c180fb09721cf5f704ad239ffa7a9789c8cc58ee997ae28974' 
  AND token = '8fmTULKH9zHzYKRD0lQO+YWFUZ+klGrBBuEiLAI5+hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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