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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62607ab340cda5d7c2c24a843151e9af7eecc0d67c10d0a7d961bbd7d9aa827' 
  AND token = 'x3/DdIi7QZND/N4hSY4Tlpntq2m+ibieu5p2DJYPLJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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