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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794f09fe95e38ae83b5c0b0e2e0e021fa05fd36c01ff02a95c222ee509fb413a' 
  AND token = 'dDi1swSus6cviwCTRMmQ2bTVVPp6A3m4xLTicqKx1tM=' 
  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"
    }
  }
}