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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a251a489b3b19210c99cf350546979612c675bec3ee6799d07f65a7ac2c513c2' 
  AND token = 'rBVGNHcaHs+DmOqDWjQv/CwmkDiGRIgS2aR8A50/Z2A=' 
  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"
    }
  }
}