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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdabfa8310a5bb5d0167eb95cb5245612b26dc589f20c344568a6df33ab416c' 
  AND token = 'RjYSPLkduVgUOvT499tw8Lf/yzL7Luhb00KVdxt8Xwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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