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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefc0fdbb572d26a467a550fcbb16acdff41b2f75973e4e4af5c344825a3bd06' 
  AND token = '20i3JNcaWmh7UAfvNdrUa7IMFFDwWj5s+E74cjSWw6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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