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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1373d31374ce218fe26980f4d86531892e2934a68e8d8e2bdd0843c1b467622' 
  AND token = 'nbzAQ6l96m3tcBy2IT2PetLvS0fWYKA/So7ItZ231gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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