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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be5ee82feede5b77bf6937658dbba7b882f2b0bf09c15163ff55c2d31582e9f' 
  AND token = 'Kqv/akjNTGlBz/t7RWyAuwBNrlUt4PtrgnfUVejUfg4=' 
  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"
    }
  }
}