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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb27a180094294ceb99e7394106c037c1e3ad53a0fdb3132c06a14b7fe956358' 
  AND token = 'aQv3BtVw0LMGqslky/KKQ3CQHqDWStK7tM6475catxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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