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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6e942ac69a3ffddab6bc3026699e47224445914662a4401da6c06d01a43fda' 
  AND token = 'iFYZiI7NP9DMv/yUNEdXD7BZWHL3Vus9DtxbhNhFomA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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