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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6473b0e903801e4e28a46c44adc8d1f77f9cee3c7c22559830da59e2db4b303e' 
  AND token = 'vV3f5NQrvweVHhsLPtM4BhzwviX0NmPV9I/uW9U4vmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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