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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47de5b3ff4fe3ecd27a0717a6cc023ada802eaf5e2409c8657523c3517b97f60' 
  AND token = 'nMyaXiZlLLREMzbBA46N3gyMnXlKI/1dr7p1aHODBrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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