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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fff7f87901e74caa0540babcd2e9b72c4ceef79db1134d02cab27983c7dbc1' 
  AND token = 'ZI3zq3b3wZ6XUuWVfLbtEqgf7ZYA2bq65mmuIhuQBbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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