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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fc6e8fa8ff8fa8eb346bc180e07082fab55429abdd7c634008f5ca1ca9ae01' 
  AND token = 'SqXaItbK4alhE3La/nnzA/y+dH+Qs9+o/V2RoEooM/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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