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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8812b0a7e32b65169aae1d25c40a105dc45d719c63390e6f45644c044531f78e' 
  AND token = 'T21W6/QvCclp1F/+lTViHC1oaylblXt74FPQN59Nzws=' 
  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"
    }
  }
}