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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17c046bcae95eeec663c8668768d4c367bba02201111de08238d0d89420471b' 
  AND token = 'mzPU1h6xX0MiAw0Wdx7JewDf+xMD3kWQr6BBTLkrKNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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