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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669617cb0102f6ac23e2212e1f3d09614994a11dce660e7ab2dd412de94b0a22' 
  AND token = 'dK6uSK754+sxkaC02q6hEKlu4APqmHmGiUDfQLiP5uI=' 
  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"
    }
  }
}