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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867621ef24eb0685f95e35fe082462b5d3d6ad17c1274de50dc3cea2bd5c3a74' 
  AND token = 'hVaHcJdtV6k5KctoUmvyhT3DvQ39K2kFZnkbTBfyfyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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