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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff85e589a876c59f810f488b6f42ab5d1475b58af71129c360eb4f5affd0423' 
  AND token = '7DBfXOa2PBGAx71hDg4nWXu96GFHs1DQdC/ukFJf9io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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